CNAE Codes — Spanish Business Activity Classification

What Are CNAE Codes?

The Clasificación Nacional de Actividades Económicas (CNAE) is Spain’s official standard for classifying economic activities. The current version, CNAE-2009, was approved by Real Decreto 475/2007 and is Spain’s adaptation of the European Union’s NACE Rev. 2 classification. NACE is in turn derived from the UN’s ISIC (International Standard Industrial Classification).

CNAE codes are 4-digit numbers arranged in a hierarchical structure:

• Section: Letter (A–U), e.g., A = Agriculture, C = Manufacturing, G = Wholesale and retail trade
• Division: 2-digit prefix, e.g., 47 = Retail trade
• Group: 3-digit code, e.g., 47.1 = Retail in non-specialised stores
• Class: 4-digit code, e.g., 4711 = Retail in non-specialised stores with predominance of food

Every Spanish business entity — companies, self-employed individuals, branches of foreign companies — must declare their CNAE code when registering with the AEAT and the Social Security system.

How It Works in Spain

Where CNAE Codes Are Used

CNAE codes appear across multiple administrative systems:

The CNAE-2009 Structure

The full CNAE-2009 classification has:

• 21 sections (A through U)
• 88 divisions
• 272 groups
• 615 classes

Key sections for foreign investors in Spain:

Technology companies typically fall under section J (codes 58–63): software publishing (5820), web portals (6312), computer programming (6201), IT consultancy (6202), data processing (6311).

Social Security: The AT/EP Rate Impact

The most financially significant consequence of the CNAE code is the occupational accident and professional disease (AT/EP) contribution rate applied to the Social Security payroll. This contribution is paid entirely by the employer on top of the general Social Security contributions.

Rates by activity risk level:

Companies registered under a low-risk CNAE that actually carry out higher-risk activities (e.g., a holding company with CNAE 6420 but with subsidiary workers doing construction) may face Social Security inspections.

CNAE vs IAE: The Distinction

CNAE and IAE are frequently confused but are different systems:

When registering a business, both CNAE and IAE codes must be correctly selected and they must be consistent with each other and with the actual activity.

Key Regulations

• Real Decreto 475/2007: approval of CNAE-2009
• Real Decreto Legislativo 2/2004 (TRLRHL): IAE framework (related but distinct)
• Resolución de 29 de abril de 2009 de la Presidencia del INE: classification rules and updates
• Social Security Order (Orden TAS 2865/2003 as updated): AT/EP contribution rates by CNAE
• Real Decreto 637/2014: updates to contribution rates aligned with CNAE-2009

Practical Implications for Foreign Investors

Correct Code Selection on Incorporation

When incorporating a Spanish S.L. or registering a branch, the CNAE code must be selected before or during the Modelo 036 census registration. Foreign founders often choose a broad code (“management consultancy” 7020 or “holding activities” 6420) without realising that the code affects Social Security costs and AEAT benchmarking.

Companies planning to carry out multiple activities should declare secondary CNAE codes alongside the primary to accurately reflect their operations. Failure to do so creates a risk of administrative penalties and potential Social Security audit.

AEAT Benchmarking and Inspection Risk

The AEAT’s risk-scoring system uses CNAE codes to benchmark a company’s declared margins, costs, and VAT recovery rates against sector norms. A company in CNAE 4711 (retail food) with gross margins significantly above or below sector averages will trigger risk flags. Foreign companies unfamiliar with Spanish sector norms sometimes inadvertently create audit triggers by filing returns that look anomalous compared to domestic peers in the same CNAE.

Updating CNAE Codes

When a business’s principal activity changes — for example, a company that was an importer (CNAE 4669) and pivots to manufacturing (CNAE 2590) — the CNAE must be updated via a Modelo 036 amendment within one month. This triggers a recalculation of the Social Security AT/EP rate for subsequent periods.

How BMC Can Help

We advise on CNAE code selection during business formation, review existing registrations for accuracy, and manage Modelo 036 updates when activities change. We also advise on the Social Security cost implications of CNAE codes for businesses expanding into new activity areas in Spain, and flag CNAE-related benchmarking risks before AEAT inspection triggers arise.